If the Work Function of a Metal Surface Is $2.20 \mathrm { eV }$

question 70

Multiple Choice

If the work function of a metal surface is $2.20 \mathrm { eV }$ , what frequency of incident light would give a maximum kinetic energy of $0.25 \mathrm { eV }$ to the photoelectrons ejected from this surface? $( 1 \mathrm { eV } = 1.60 \times$ $\left. 10 ^{- 19} \mathrm {~J} , h = 6.626 \times 10 ^{- 34}\mathrm {~J} \cdot \mathrm { s } \right)$

• A) \(1.02 \times 10 ^ { 14 } \mathrm {~Hz}\)
• B) \(2.05 \times 10 ^ { 14 } \mathrm {~Hz}\)
• C) \(5.92 \times 10 ^ { 14 } \mathrm {~Hz}\)
• D) \(2.50 \times 10 ^ { 14 } \mathrm {~Hz}\)
• E) \(3.53 \times 10 ^ { 14 } \mathrm {~Hz}\)

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